package com.wugui.datax.admin.util;

import static com.wugui.datatx.core.util.Constants.SPLIT_COMMA;

import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

import com.alibaba.fastjson.JSON;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

/**
 * Created by jingwk on 2019/12/01
 */
public class JwtTokenUtils {

	public static final String TOKEN_HEADER = "Authorization";
	public static final String TOKEN_PREFIX = "Bearer ";

	private static final String SECRET = "datax_admin";
	private static final String ISS = "admin";

	// 角色的key
	private static final String ROLE_CLAIMS = "rol";

	// 过期时间是3600秒，既是24个小时
	private static final long EXPIRATION = 86400L;

	// 选择了记住我之后的过期时间为7天
	private static final long EXPIRATION_REMEMBER = 7 * EXPIRATION;

	// 创建token
	public static String createToken(Integer id, String username, String role, boolean isRememberMe) {
		long expiration = isRememberMe ? EXPIRATION_REMEMBER : EXPIRATION;
		HashMap<String, Object> map = new HashMap<>();
		map.put(ROLE_CLAIMS, role);
		return Jwts.builder().signWith(SignatureAlgorithm.HS512, SECRET).setClaims(map).setIssuer(ISS)
				.setSubject(id + SPLIT_COMMA + username).setIssuedAt(new Date())
				.setExpiration(new Date(System.currentTimeMillis() + expiration * 1000)).compact();
	}

	// 从token中获取用户名
	public static String getUsername(String token) {
		List<String> userInfo = Arrays.asList(getTokenBody(token).getSubject().split(SPLIT_COMMA));
		return userInfo.get(1);
	}

	// 从token中获取用户名
	public static Integer getUserId(String token) {
		String s = JSON.toJSONString(getTokenBody(token).getSubject());
		List<String> userInfo = Arrays.asList(getTokenBody(token).getSubject().split(SPLIT_COMMA));
		return Integer.parseInt(userInfo.get(0));
	}

	// 获取用户角色
	public static String getUserRole(String token) {
		return (String) getTokenBody(token).get(ROLE_CLAIMS);
	}

	// 是否已过期
	public static boolean isExpiration(String token) {
		try {
			return getTokenBody(token).getExpiration().before(new Date());
		} catch (ExpiredJwtException e) {
			return true;
		}
	}

	private static Claims getTokenBody(String token) {
		return Jwts.parser().setSigningKey(SECRET).parseClaimsJws(token).getBody();
	}
}
